30. GWD25-Q30. Museums that house Renaissance oil paintings typically store them in envbironments that are carefully kept within narrow margins of temperature and humidity to inhibit any deteri- oration. Laboratory tests have shown that the kind of oil paint used in these paintings actually adjusts to climatic changes quite well. If, as some museum directors believe, paint is the most sensitive substance in these works, then by relaxing the stan- dards for temperature and humidity control, museums can reduce energy costs without risking damage to these paintings. Museums would be rash to relax those standards, however, since results of preliminary tests indicate that gesso, a compound routinely used by Renaissance artists to help paint adhere to the canvas, is unable to withstand significant variations in humidity.
In the argument above, the two portions in boldface play which of the following roles? A. The first is an objection that has been raised against the position taken by the argument; the second is the position taken by the argument. B. The first is the position taken by the argument; the second is the position that the argument calls into question. C. The first is a judgment that has been offered in support of the position that the argu- ment calls into question; the second is a circumstance on which that judgment is, in part based. D. The first is a judgment that has been offered in support of the position that the argu- ment calls into question; the second is that positon. E. The first is a claim that the argument calls into question; the second is the position taken by the argument. Answer: 答案是D，我选B， 请大牛帮忙分析一下。 | 
